List of best mirrors for IP address 18.222.203.203, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/raspbian/pool/main/l/llvm-toolchain-18/libclang-cpp18-dev_18.1.8-17+rpi1+b1_armhf.deb